High-performance acetone gas sensor based on Pt–Zn2SnO4 hollow octahedra for diabetic diagnosis

•The Pt–ZTO hollow octahedra were synthesised for acetone gas sensor.•The Pt–ZTO sensor could detect acetone at ppb level with excellent selectivity and stability.•The Pt–ZTO sensor exhibited a 36.9-fold enhancement in response to acetone compared with the pristine ZTO.•The Pt–ZTO sensor can be applied for diabetes diagnosis applications.